Testing Math in Markdown
$ \mathcal{A} = \langle \Theta, S, \mathcal{E}, \delta \rangle $ $$ \mathcal{A} = \langle \Theta, S, \mathcal{E}, \delta \rangle $$ \[ \mathcal{A} = \langle \Theta, S, \mathcal{E}, \delta \rangle \] \( \mathcal{A} = \langle \Theta, S, \mathcal{E}, \delta \rangle \)